Search

KR-102962851-B1 - ECO-FRIENDLY RECYCLED COLD MIX ASPHALT CONCRETE AND MANUFACTURING METHOD THEREOF

KR102962851B1KR 102962851 B1KR102962851 B1KR 102962851B1KR-102962851-B1

Abstract

The present invention relates to an eco-friendly recycled cold-air asphalt concrete and a method for manufacturing the same. More specifically, it relates to an eco-friendly recycled cold-air asphalt concrete and a method for manufacturing the same, which uses recycled aggregate produced by recycling waste asphalt concrete generated during maintenance or excavation work of asphalt concrete pavements as the main material, enables mixing and construction at room temperature without a separate heating process, and has performance that satisfies the quality standards of the Ministry of Land, Infrastructure and Transport’s Notification “Guidelines for Asphalt Concrete Pavement Construction (Revised July 2024).” The eco-friendly recycled cold asphalt according to the present invention comprises recycled aggregate manufactured by recycling waste asphalt and is capable of being mixed and constructed at room temperature without separate heating, wherein it comprises coarse aggregate, fine aggregate, filler, emulsified asphalt (AP), and water, and the filler is composed of a non-plastic inorganic binder, and the recycled cold asphalt is characterized by being formulated to satisfy performance of deformation strength of 3.6 MPa or more, Marshall stability of 6,000 N or more, indirect tensile strength of 0.40 MPa or more, tensile strength ratio (TSR) of 0.70 or more, void ratio of 4~14%, and flow value of 10~40 (1/100 cm).

Inventors

  • 송기순
  • 송호현

Dates

Publication Date
20260508
Application Date
20250723

Claims (7)

  1. In an eco-friendly recycled cold-air asphalt concrete containing recycled aggregate manufactured by recycling waste asphalt concrete, which can be mixed and constructed at room temperature without separate heating, Contains coarse aggregate, fine aggregate, filler, emulsified asphalt (AP), and water, The above filler is composed of a non-fired inorganic binder, The above recycled room-temperature asphalt is, It is formulated to satisfy performance characteristics such as deformation strength of 3.7 MPa or higher, Marshall stability of 12,000 N or higher, indirect tensile strength of 0.42 MPa or higher, tensile strength ratio (TSR) of 0.80 or higher, porosity of 10 to 12%, and flow value of 38 to 40 (1/100 cm), and The above recycled room-temperature asphalt is, It is mixed with 45.3 ± 5 parts by weight of coarse aggregate, 47.15 ± 5 parts by weight of fine aggregate, 0.95 ± 0.05 parts by weight of filler, 3.1 ± 0.1 parts by weight of emulsified asphalt (AP), and 3.5 ± 1 parts by weight of water, and The above coarse aggregate has a maximum particle size of 20 mm or less, and The above fine aggregate has a maximum particle size of 10 mm or less, and The above-mentioned non-fired inorganic binder is, Eco-friendly recycled room-temperature asphalt characterized by including TDF incineration ash, slag fine powder, fly ash, geopolymer fine powder, and blast furnace slag fine powder.
  2. delete
  3. delete
  4. delete
  5. In paragraph 1, The above recycled room-temperature asphalt is, Environmentally friendly recycled cold asphalt concrete characterized by performance verifiable according to test methods specified in Asphalt Concrete Pavement Construction Guidelines (revised July 2024), KS F 2364 (2002), or KS F 2446 (2020), depending on the item.
  6. In a method for manufacturing eco-friendly recycled room-temperature asphalt according to paragraph 1, (a) A coarse aggregate preparation step in which waste asphalt concrete with a size of 20~13 mm is added as coarse aggregate; (b) A fine aggregate preparation step in which waste asphalt concrete with a size of 10 mm or less is added as fine aggregate; (c) A step of adding a filler made of a non-fired inorganic binder to the coarse aggregate and fine aggregate; (d) A first mixing step for first mixing the above coarse aggregate, fine aggregate, and filler; (e) A water addition step of adding water to the first mixture; (f) a secondary mixing step for secondary mixing the mixture into which the water was introduced; (g) A step of adding emulsified asphalt to the secondary mixture; (h) A final mixing step for finally mixing the mixture into which the above-mentioned emulsified asphalt has been added; (i) a compaction step of compacting the above final mixture at least 75 times; and (j) a curing step comprising curing the compacted mixture at (60±1)℃ for 48 hours and then curing it at room temperature for an additional 24 hours; and The above filler is composed of a non-fired inorganic binder, The above recycled room-temperature asphalt is, It is formulated to satisfy performance characteristics such as deformation strength of 3.7 MPa or higher, Marshall stability of 12,000 N or higher, indirect tensile strength of 0.42 MPa or higher, tensile strength ratio (TSR) of 0.80 or higher, porosity of 10 to 12%, and flow value of 38 to 40 (1/100 cm), and The above recycled room-temperature asphalt is, It is mixed with 45.3 ± 5 parts by weight of coarse aggregate, 47.15 ± 5 parts by weight of fine aggregate, 0.95 ± 0.05 parts by weight of filler, 3.1 ± 0.1 parts by weight of emulsified asphalt (AP), and 3.5 ± 1 parts by weight of water, and The above-mentioned non-fired inorganic binder is, A method for manufacturing eco-friendly recycled room-temperature asphalt concrete characterized by including TDF incineration ash, slag fine powder, fly ash, geopolymer fine powder, and blast furnace slag fine powder.
  7. In paragraph 6, The above manufacturing method is, (k) A test step for testing stability, flow value, apparent density, porosity, indirect tensile strength, and tensile strength ratio (TSR) after immersing the above-mentioned cured mixture in water at 40°C for 30 minutes; further comprising an eco-friendly recycled room-temperature asphalt method.

Description

Eco-friendly Recycled Cold Mix Asphalt Concrete and Manufacturing Method Thereof The present invention relates to an eco-friendly recycled cold-air asphalt concrete and a method for manufacturing the same. More specifically, it relates to an eco-friendly recycled cold-air asphalt concrete and a method for manufacturing the same, which uses recycled aggregate produced by recycling waste asphalt concrete generated during maintenance or excavation work of asphalt concrete pavements as the main material, enables mixing and construction at room temperature without a separate heating process, and has performance that satisfies the quality standards of the Ministry of Land, Infrastructure and Transport’s Notification “Guidelines for Asphalt Concrete Pavement Construction (Revised July 2024).” Asphalt pavement fillers fill the gaps between aggregates within the mixture and combine with the asphalt binder to function as a filler-binder; therefore, their quality significantly affects the consistency and performance of the asphalt mixture. Conventionally, limestone powder obtained by the thermal decomposition of limestone or simply crushed limestone powder has been used; however, the former is not widely used in industrial sites due to its high cost, and fly ash is used only restrictively as an asphalt filler because it has low density and often fails to meet specified standards for quality characteristics such as flow values. In addition, electric furnace steelmaking dust, casting dust, etc., are not suitable as eco-friendly materials due to the risk of heavy metal leaching caused by their heavy metal content. In this regard, Korean registered patent No. 10-0243926 proposed a method for manufacturing road paving concrete by mixing 250,500 kg/m³ of Portland cement with crushed waste asphalt aggregate, and registered patent No. 10-0599492 disclosed a semi-rigid paving composition comprising cement, a volume expander, a water-repellent agent, a hardening accelerator, and various fillers in waste asphalt. However, these technologies use large amounts of cement and filler, so they are not asphalt paving mixtures characterized by flexible paving, but rather semi-rigid paving mixtures, and the filler content in the mixture exceeds 3 to 6% of that of general asphalt paving filler, making them uneconomical. In addition, the cement manufacturing process emits a large amount of CO2 , and there are issues of resource consumption and environmental damage. Furthermore, auxiliary materials such as gypsum and CSA have the disadvantage of being expensive and highly dependent on imports. Technologies such as Korean registered patents No. 10-0958066, No. 10-0871104, and No. 10-0788051 also have limitations in economic efficiency and eco-friendliness, as most of them use cement as the main filler or add auxiliary materials such as fly ash and gypsum. As an improved technology regarding this, Korean Registered Patent No. 10-1242097 (published March 11, 2013) proposed an “eco-friendly room-temperature recycled asphalt” that uses industrial by-products, including TDF incineration ash, a non-calcined inorganic binder, as fillers. However, the aforementioned conventional technologies did not have significant issues with quality satisfaction under the standards prior to the revision of the Ministry of Land, Infrastructure and Transport’s “Asphalt Concrete Pavement Construction Guidelines,” which included a deformation strength of 2.5 MPa or more, a tensile strength ratio (TSR) of 0.60 or more, a Marshall stability of 4,000 N or more, and a porosity of 4~16%. However, with the quality standards being strengthened according to the construction guidelines revised in July 2024 to include a deformation strength of 3.6 MPa or more, a Marshall stability of 6,000 N or more, a TSR of 0.70 or more, and a porosity of 4~14%, there was a problem in that these conventional technologies could not be considered to satisfy the revised standards. Therefore, there is a demand for eco-friendly recycled ambient temperature asphalt that can reliably meet the strengthened quality standards of the revised construction guidelines while simultaneously ensuring ambient temperature workability without the need for a heating process, as well as resource recycling and energy saving effects. FIG. 1 is a flowchart of a method for manufacturing eco-friendly recycled room-temperature asphalt concrete according to an embodiment of the present invention. FIGS. 2 to 6 are exemplary photographs of raw materials mixed into eco-friendly recycled room-temperature asphalt concrete according to an embodiment of the present invention. FIG. 7 is an example photograph of recycled room-temperature asphalt produced by the method for producing eco-friendly recycled room-temperature asphalt according to an embodiment of the present invention. The composition and manufacturing method of the eco-friendly recycled room-temperature asphalt concrete according to the present invention will be desc